Question Bank • QB_SUB_FP_HYD_001 MCQ • 1 Mark

Section 3: Farm Power

Tractors and Power Tillers

Subtopic: Steering and hydraulic control systems used in tractors

Question Statement:

In a tractor hydraulic 3-point lift system, the relief valve is set to open when:

Options:

  • (A) System hydraulic pressure exceeds the maximum safe design threshold (typically 15–20 MPa)
  • (B) Oil temperature drops below 0°C
  • (C) The tractor shifts into reverse
  • (D) The engine reaches idle speed

Answer Key:

A

Step-by-Step Solution & Explanation

The main hydraulic relief valve protects the pump, valves, and ram cylinder against bursting pressures when lifting excessive loads.
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